comparisons between iec vs ansi switchgear.pdf

27
7/24/2019 comparisons between iec vs ansi switchgear.pdf http://slidepdf.com/reader/full/comparisons-between-iec-vs-ansi-switchgearpdf 1/27 SpotLIGHT Webinar Arney Kaner - May 3, 2013 ompar sons e ween an  ANSI/IEEE switchgear features © ABB Inc. May 2, 2013 | Slide 1

Transcript of comparisons between iec vs ansi switchgear.pdf

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SpotLIGHT Webinar Arney Kaner - May 3, 2013

ompar sons e ween an ANSI/IEEE switchgear features

© ABB Inc.

May 2, 2013 | Slide 1

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 ANSI vs. IEC standards

IEC = International Electrotechnical

omm ss on

Founded in 1904 in St. Louis, MO

Reco nized b the World Trade

Organization

Consists of over 50 NationalCommittees, each havin e ual votin

rights

Represents 85 % of the world’s

population and 95 % of the electric

energy produced and consumed

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Potential customer profile and application

• Self-insured entities, such as an Electric Utility.

Large, heavy industrial enterprise , i.e. aluminum smelter, steel mill,refinery.

• Ex erience and willin ness to work with the local electrical ins ector.

• Confined space – need “front access only” type of equipment

• Non-Standard system voltage, i.e. 16kV, 24kV

• Customer wants to have a grounding switch for outgoing feeders.

• Equipment ratings do not exceed 600A/31.5kA, since within these

ratings IEC switchgear has dimensional advantages.

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 ANSI vs. IEC standards

Medium Voltage Switchgear 

 ANSI C37 vs. IEC 62271

Low Voltage Switchgear 

, , vs.

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Degree of protection per IEC 60529

Protection against ingress of solid foreign objects

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Degree of protection per IEC 60529

Protection against harmful ingress of water 

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 ANSI vs. IEC standards

Motor Control Center 

 ANSI/UL: Different standards for Switchgear and Motor Control

Centers

IEC: No differentiation one common standard

Temperature ratings

 ANSI: Ambient temperature between -30°C and +40°C

IEC: Maximum of +40°C (options for +50/55°C) and minimum of

-5°C (options for -15/25°C)

Installation

 ANSI: Indoor and outdoor

IEC: Indoor only

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 ANSI vs. IEC standards

Interlocking

 ANSI: Specific rules; key-interlocking preferred

IEC: General rules, electro-mechanic interlocking preferred

nc osure

 ANSI: Differentiation between enclosure and vent openings,

minimum thickness

IEC: No differentiation and no specification

Insulation

IEC: Busbar design left to the manufacturer 

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 ANSI vs. IEC standards

Instrument Transformers

 ANSI: Window-type current transformers on both sides of the

circuit breaker 

IEC: Cast resin current transformers on line-side of the circuit

breaker 

Option for non-traditional current and voltage sensors in IEC

switch ear 

Low Voltage Compartment

 ANSI: Depending on specific designs, there may not be a LV

 –breaker compartment door 

IEC: LV compartment with metallic separation from HV

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 ANSI vs. IEC standards

Electromagnetic Compatibility

UL: No specification

IEC: General rules, electro-mechanic interlocking preferred

e ec r c es ng

UL: No BIL test required, lower power frequency test voltage

IEC: BIL test with 1.2/50 re uired, hi her ower fre uenc test

voltage

Clearances

IEC: Creepage distances defined based on material quality,

clearances defined based on over-voltage category

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Definitions - IEC 62271

Compartment Accessibility

Interlock-controlled accessible

Procedure-based accessible

oo - ase access e

Non-accessible

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Definitions - IEC 62271

Loss of Service Continuity

LSC1

Switchgear must be completely

de-ener ized before o enin

circuit breaker compartment

LSC2A

,

functional units adjacent to the

one to be opened can remain

energized

LSC2B

 As LSC2A, but cable

1 LV Compartment

Pressure Relief Duct (optional)2

energizedCircuit Breaker Compartment

Cable Compartment

4

5

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Definitions - IEC 62271

Internal Arc Classification

 Accessibility: A, B or C – front / lateral /

rear 

 A (F, L, R): to authorized

personnel

B (F, L, R): to all

installation

Test values

Test current in kilo-amperes (kA)

Duration in seconds (s)

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Definitions - IEC 62271 / 61641

Test Criteria for Personnel Protection

Doors must remain closed and no opening of the cover panels

must occur 

No hazardous arts to be e ected

No holes in the external housing in any parts accessible to

personnel

incinerate

 All earthing connections must remain effective

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Definitions - VDE0660 part 500

Test Criteria for Plant Protection (incl. System Function)

 Arc must be limited to defined area and must not re-ignite in

adjacent units

Emer enc o eration of the switch ear ossible after fault has

been repaired and/ or respective functional units of the defined

area have been isolated or removed

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Differences between IEEE and IEC AR testing

The two largest differences between the IEEE C37.20.7 and the IEC²

IEC Type B accessibility. IEEE C37.20.7 testing used 150gm/ m²cotton material for all accessibility ratings of 2, 2B and 2C and 2BC. Inaddition, we place all test cloths 10cm from the front and sides of the

.

The IEEE testing guide defines the Rating Basis as the rated short

time current of the equipment. The testing guide permits a minimumof 10-c cles 0.167s throu h a maximum of 30-c cles 0.5s of ratedarc duration. The minimum duration of 0.167s is designed as an arc-fault test for resistance of the switchgear to pressure increase. Thistests the ability to contain the explosive forces until the expanding gasis relieved in a controlled manner and for burn-throu h of the arcin

erosion of the switchgear walls until most relaying will remove thesource of the fault. The maximum test duration of 0.5s establishes alonger time duration to show burn-through resistance for longer relaycoordination before the fault source is removed.

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IEC vs. IEEE arc-resistant requirements

IEC 62271-200 vs. IEEE C37.20.7 ARC-RESISTANT REQUIREMENTS

Requirement IEEE C37.20.7 IEC 62271-200

Test Voltage Same as equipment Same as equipment

es urren pea . x rms . x rms

Test Duration 167ms for pressure

0.5 sec for burn-through

167ms for pressure

1 sec for burn-through*

 Arc- Initiation 0.5mm diameter wire 0.5mm diameter wire

Indicators 150g/m / m² all Types150mm x 150mm frame

150g/m / m² Type A40g/m / m² Type B *

150mm x 150mm frame

2 meters high

.

B. front / sides 10cm away

C. front / side / adjacent 10cm away *

.

B. facing surfaces 10cm away

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 ANSI vs. IEC standards

For Switchgear ANSI / UL and IEC have very different philosophies

IEC Standards DO…

…define requirements for performance and testing

an ar s …

…define fabrication techniques and material solutions

Neither ANSI / UL nor IEC is “better”

Note, however, that UL does not define arc-resistance

Do not try to “mix and match” ANSI /UL and IEC standards

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IEC Switchgear 

© ABB Inc.

May 2, 2013 | Slide 19

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IEC Switchgear 

© ABB Inc.

May 2, 2013 | Slide 20

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UniGear ZS1 single level section view

Unit compartments

 A Circuit-breaker compartment

B Main Bus compartment

a e compar men

D Low voltage compartment

E Compact gas duct channel

© ABB Inc.

May 2, 2013 | Slide 21

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 ABB UniGear 

Passive Arc Protection

Design to withstand the thermo-

dynamic stress of an internal arc

Se mentation into com artments

Mechanical rigidity

Pressure relief with arc duct

Protective relaying

 Active Arc Protection (optional)

exposure to an internal arc

Pressure sensors

Combination of optical and current

sensors

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 ABB UniGear 

Vacuum circuit breakers

Spring mechanism

Magnetic actuator 

Fused vacuum contactor 

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 ABB UniGear 

Conventional current and voltage transformers

Innovative current and voltage sensors

Large dynamic range

nsens ve o erroresonance an

voltage components

Short-circuit proof 

Short delivery

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Questions to ask the customer to identify opportunity

Would your insurance carrier recognize non-UL listing/certificate?

xamp es: ; ana a

• Would you work with your local electrical inspector to get a permit?

 ABB will provide all required technical support.

• If the switchgear is installed against the wall, and does not require rear

access – would it solve your problem?

• s e es gn oa w n an e ava a e s or c rcu curren

does not exceed 31.5kA? ABB’s IEC switchgear would save both

space and money.

© ABB Inc.

May 2, 2013 | Slide 25

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Contact information

If you have further questions , please contact me:

PRESENTER Arney Kaner, PE

COMPANY ABB Inc.

PHONE (847) 486-1290

- . . .

© ABB Inc.

May 2, 2013 | Slide 26

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